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Abstract

The springs formed from 3.8 mm diam cold-drawn carbon steel wire failed to comply with load-test requirements. A split wire in the spring was revealed by investigation. A smooth heat-tinted longitudinal zone was observed in the fracture. It was concluded that the spring failed in the load test due to the split wire. The reason for the condition was interpreted to be overdrawing which resulted in intense internal strains, high circumferential surface tension, and decreased ductility.

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